Sofa



FIG. 1 is a perspective view of a sofa showing my new design from the front, left end and top;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left end elevational view thereof, the right end being a mirror image thereof; and,

FIG. 4 is a rear elevational view thereof.

The bottom thereof is plain and unornamented.

The broken line showing in all figures represents stitching. 

The ornamental design for a sofa, as shown and described. 